# Thermal simulation not showing diode losses

**URL:** <https://forum.plexim.com/t/thermal-simulation-not-showing-diode-losses/1221>\
**Category:** PLECS\
**Tags:** thermal-model-igbt\
**Created:** [March 22, 2023, 7:13am UTC](https://forum.plexim.com/t/thermal-simulation-not-showing-diode-losses/1221 "2023-03-22T07:13:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Marco\_Santos\_96](https://avatars.discourse-cdn.com/v4/letter/m/aca169/32.png) [@Marco\_Santos\_96](https://forum.plexim.com/u/Marco_Santos_96)\
**Post date:** [March 22, 2023, 7:13am UTC](https://forum.plexim.com/t/thermal-simulation-not-showing-diode-losses/1221/1 "2023-03-22T07:13:02Z")

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Hello,

I’m new to PLECS and have been doing some simulations to better understand its functionalities. I did some tests with a simple Boost converter and later tried to introduce the thermal description of one IGBT, in particular, the FF300R12KT4P from Infineon.

Something I noticed is that the antiparallel diode is not presenting any losses. Please, could you provide an explanation for this behaviour?

In attachment, you will find all the relevant files.

Thank you in advance for your time.

[IGBT THERMAL.plecs](https://forum.plexim.com/uploads/short-url/d3oFaR016QjXfR9ioR2x3AGqw8R.plecs) (27.5 KB)

[FF300R12KT4P\_igbt.xml](https://forum.plexim.com/uploads/short-url/rl2BHX3hwcgyza0WW4eaCJJ8EOw.xml) (15.4 KB)

[FF300R12KT4P\_diode.xml](https://forum.plexim.com/uploads/short-url/5PiE2DVmdpG77FgDCnWdwbj4PQZ.xml) (11.1 KB)

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**Author:** ![Oliver\_Schwartz](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/oliver_schwartz/32/6_2.png) [@Oliver\_Schwartz](https://forum.plexim.com/u/Oliver_Schwartz)\
**Post date:** [March 29, 2023, 1:36am UTC](https://forum.plexim.com/t/thermal-simulation-not-showing-diode-losses/1221/2 "2023-03-29T01:36:39Z")

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The antiparallel diode is never conducting, so it produces no losses.